Nitrogen deposition and temperature structure fungal communities associated with alpine moss-sedge heath in the UK

Taylor, Andy F. S.; Freitag, Thomas E.; Robinson, Lucinda; White, Duncan; Hedley, Pete E.; Britton, Andrea J.

doi:10.1016/j.funeco.2022.101191

Cited by 3 publications

(3 citation statements)

References 72 publications

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“…Compared with the N30 treatment, the relative abundance of Ascomycota decreased significantly in the N50 treatment. Nitrogen deposition has different effects on the relative abundance of Ascomycota and Basidiomycota , which have both positive and negative effects (Weber et al, 2013 ; Wang et al, 2021 ; Taylor Andy et al, 2022 ). This is mainly due to fungi's high N conservative, meaning that they do not necessarily require large amounts of N to meet their growth needs (Allison et al, 2009 ).…”

Section: Discussionmentioning

confidence: 99%

Metagenomics reveals the response of desert steppe microbial communities and carbon-nitrogen cycling functional genes to nitrogen deposition

Ye,

Zhao,

et al. 2024

Front. Microbiol.

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IntroductionNitrogen (N) deposition seriously affects the function of carbon (C) and N cycling in terrestrial ecosystems by altering soil microbial communities, especially in desert steppe ecosystems. However, there is a need for a comprehensive understanding of how microorganisms involved in each C and N cycle process respond to N deposition.MethodsIn this study, shotgun metagenome sequencing was used to investigate variations in soil C and N cycling-related genes in the desert steppe in northern China after 6 years of the following N deposition: N0 (control); N30 (N addition 30 kg ha−1 year−1): N50 (N addition 50 kg ha−1 year−1).ResultsN deposition significantly increased the relative abundance of Actinobacteria (P < 0.05) while significantly decreased the relative abundances of Proteobacteria and Acidobacteria (P < 0.05). This significantly impacted the microbial community composition in desert steppe soils. The annual addition or deposition of 50 kg ha−1 year−1 for up to 6 years did not affect the C cycle gene abundance but changed the C cycle-related microorganism community structure. The process of the N cycle in the desert steppe was affected by N deposition (50 kg ha−1 year−1), which increased the abundance of the pmoA-amoA gene related to nitrification and the nirB gene associated with assimilation nitrite reductase. There may be a niche overlap between microorganisms involved in the same C and N cycling processes.DiscussionThis study provides new insights into the effects of N deposition on soil microbial communities and functions in desert steppe and a better understanding of the ecological consequences of anthropogenic N addition.

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Section: Discussionmentioning

confidence: 99%

Metagenomics reveals the response of desert steppe microbial communities and carbon-nitrogen cycling functional genes to nitrogen deposition

Ye,

Zhao,

et al. 2024

Front. Microbiol.

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“…Finally, existing evidence for the effects of N deposition on cryptogams includes a loss in moss cover in an alpine Racomitrium moss-sedge heath in the United Kingdom (Britton et al ., 2018), a general decline in richness, and a community shift from bryophytes and lichens towards graminoids (Nilsson et al ., 2002; Armitage et al ., 2014; Britton et al ., 2019). Declines in moss cover are possibly due to the positive effects of N deposition on the growth of moss-associated fungi (Taylor et al ., 2022). In a study in Norway, N addition caused a decrease in lichen cover and size (Fremstad, Paal & Mols, 2005), whereas in northern Sweden, N, P, and K fertilisation positively affected bryophyte biomass (Haugwitz & Michelsen, 2011).…”

Section: Cryptogams and Biological Soil Crustsmentioning

confidence: 99%

Biodiversity in mountain soils above the treeline

Praeg,

Steinwandter,

Urbach

et al. 2023

Preprint

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Despite the importance of healthy soils for human livelihood, wellbeing, and safety, current gaps in our knowledge and understanding of biodiversity in soil are numerous, undermining conservation efforts. These gaps are particularly wide in mountain regions where healthy soils are especially important for human safety and yet evidence is accumulating of ongoing degradation, posing significant threats to ecosystem functioning and human settlements.To analyse these gaps in detail, we synthesise current research on the global diversity of microorganisms, cryptogams, and invertebrates in mountain soils above the treeline. This synthesis is based on a semi-quantitative survey of the literature and an expert-based analysis. Our work reveals not only deficiencies in geographic cover but also significant gaps in taxonomic coverage, particularly among soil protists and invertebrates, and a lack of (functional and ecological) description of the uncultivated majority of prokaryotes, fungi, and protists. We subsequently build on this overview to highlight opportunities for research on mountain soils as systems of co-occurring species that interact in complex environmental matrices to fulfil critical functions and make essential contributions to life on land.Closing gaps in biodiversity research in mountain soil is crucial to enhance our understanding and to promote laws and guidelines advancing international soil biodiversity conservation targets in mountains. Addressing sparse and biased data, recognizing the impact of environmental changes on mountain ecosystems, and advocating dedicated policies are essential strategies to safeguard mountain soils and their biodiversity.GLOSSARY

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“…Furthermore, several bryophytes house cyanobacteria (Adams & Duggan, 2008); non‐cyanobacterial diazotrophs may also be related to N fixation in bryophyte assemblies (Holland‐Moritz et al, 2021). The N compounds stored in bryophytes are transferred to the underlying substrates via leakage during rehydration (Coxson, 1991; Liu et al, 2020) and bryophyte shoot decomposition (Taylor et al, 2022). Considering this N flow from bryophytes to the underlying CWD, bryophytes may increase the N content in CWD and affect the CWD decay process.…”

Section: Introductionmentioning

confidence: 99%

Bryophytes enhance nitrogen content in decaying wood via biological interactions

Oishi

2024

Ecosphere

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An increase in the nitrogen (N) content in coarse woody debris (CWD) facilitates its decomposition, affecting the cycling of N and other nutrients in forest ecosystems. Bryophytes may increase the N content by transferring the N in bryophyte tissues to the underlying CWD. This study examined whether and how bryophytes increase N content in the underlying CWD using N‐stable isotope ratios (δ15N) as tracers for N sources. The N content and δ15N values in CWD with bryophytes were significantly higher than those in CWD without bryophytes. However, the δ15N values in CWD with bryophytes differed significantly from those in bryophytes on CWD, demonstrating that the N in bryophytes did not cause the increase in N content in CWD. The analyses using δ15N further indicated that the high N content in CWD with bryophytes may be attributed to increased N supply from wood‐decomposing fungi and N‐fixing bacteria. This increase in N content may result from the enhanced moisture content in CWD beneath bryophytes, which facilitates the activity of wood‐decomposing fungi and N‐fixing bacteria. Notably, the influence of bryophytes on the N content in CWD differed between bryophyte life forms: bryophytes that form dense mats increased the N content in CWD, whereas those with loose mats decreased the N content. This difference can be explained by the greater humidity experienced by CWD with bryophytes forming dense mats than that experienced by CWD with bryophytes forming loose mats. Given that the N content in CWD affects the decay processes, the results highlight the importance of biological interactions associated with bryophytes in forest ecosystems.

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Nitrogen deposition and temperature structure fungal communities associated with alpine moss-sedge heath in the UK

Cited by 3 publications

References 72 publications

Metagenomics reveals the response of desert steppe microbial communities and carbon-nitrogen cycling functional genes to nitrogen deposition

Metagenomics reveals the response of desert steppe microbial communities and carbon-nitrogen cycling functional genes to nitrogen deposition

Biodiversity in mountain soils above the treeline

Bryophytes enhance nitrogen content in decaying wood via biological interactions

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